Spraying device



J. C. PURDIE SPRAYING DEVICE June 26, 1934.

Filed Jan. ll, 1933 mm Y ww TIL Si S.

Patented June 26, 1934 SPRAYING DEVICE John C. Purdie, Chicago, Ill.

Application January 11,

6 Claims.

My invention relates to improvements in spraying devices and consists in the combinations, constructions, and arrangements herein described and claimed.

An object of my invention is to provide a spraying device embodying certain improvements over the spraying device set forth in my application for patent on Spraying device, Serial No. 626,930 liled July 30, 1932.

A further object is to provide a spraying device embodying means operable by the operator for Varying the density of the spray.

A further object is to provide a spraying device so constructed that the parts thereof may be easily assembled and disassembled for repair purposes.

A further object is to provide a spraying device which is simple in construction and easily operated.

Other objects and advantages will appear in the following specication, and the novel features of the invention will be particularly pointed out in the appended claims.

In the accompanying drawing:

Figure 1 is an elevational view of my invention.

Figure 2 is a longitudinal sectional View of my invention, and

Figure 3 is a vertical sectional view taken along the line 3-3 of Figure 2.

Figure 4 is a fragmentary vertical sectional view on an enlarged scale of the forward portion of the device.

In carrying out my invention I provide a tubular barrel 10 having one end connected with a valve mechanism 12 by any suitable means such as a ferrule 14, the valve mechanism in turn being connected with a gas supply line 16. The valve mechanism is preferably of the type disclosed in my application for patent, Serial No. 610,930, led May 12, 1932.

A tubular extension 18 has one end connected with the barrel 10 by a band or ferrule 20. The extension 18 and the ferrule 20 are provided with threads, in order that the extension 18 may be rotated for being removed axially with respect to the barrel 10.

The ferrule 20 is provided with an inwardly extending annular flange portion 22 adapted for engagement with a shoulder 24 of the extension 18 for limiting the axial movement of the extension with respect to the barrel 10.

The extension 18 is provided with an internally threaded end portion for receiving the threaded end of a nozzle 26. The nozzle is provided with 1933, Serial N0. 651,082

an end wall 28 provided with an outlet passageway 30 therein.

A tubular member 32 is disposed within the barrel and extension and is coaxial therewith.

The tubular member 32 has one end connected with a connecting member 34 which is threaded and extends through a threaded opening in the barrel. A tting 36 is connected with the outer end of the connecting member 34 and is adapted for connection with a liquid supply line 38.

The tting 36 and the connecting member 34 are provided with aligned. passageways therethrough for providing communication between the liquid supply line 38 and the tubular member 32.

The tubular member 32 extends within the nozzle 26 and has the end thereof threaded internally for receiving an externally threaded end element 40 therein provided with a passageway 42 therein of lesser diameter than the passageway through the tubular member 32.

A sleeve 44 is slidably disposed on the tubular member 32 and has an externally threaded end portion for connection with the internally threaded end of a tubular element 46. The other end of the tubular element 46 is internally threaded for receiving a threaded plug 48. The plug 48 closes the end of the sleeve.

A valve seat element 50 is connected with the sleeve by means of the plug 48. The sleeve is normally positioned for retaining the valve seat element 50 in engagement with the end element 40 for closing the passageway 42. The tubular element 46 is provided with openings 52 adjacent to the threaded plug 48 in order that when the seat element 50 is moved out of engagement with the end element 46, as shown in Figure 4, liquid under pressure in the tubular member 32 may flow through the passageway 42 and the openings 52 into the nozzle.

It will be noted that the sleeve 44 and the tubular element 46 are disposed in spaced relationship with respect to the extension 18 and the nozzle 26 for providing a passageway 54 therebetween.

The sleeve 44 and the nozzle 46 are provided with openings 56 therein in order that any liquid which flows back between the tubular member 32, and the sleeve and the tubular element, may iiow into the passageway 54.

l A guide means 58 is connected with the extension 18 for properly positioning the sleeve, the tubular member and the elements associated therewith without obstructing the passageway 54.

A plunger 60 is slidably disposed in the barrel and comprises a head portion 62 and a reduced portion 64.

The head portion and reduced portion are provided with chambers 66 and G8 respectively which are separated by a wall portion 70. The reduced portion is provided with a slotted opening '72 ther'ein for receiving the connecting member 34, which extends within the chamber 68 for connection with the tubular member 32. The slotted opening '72 provides for the unimpeded movement of the plunger 60.

The end of the reduced portion 64 is internally threaded for being connected with an externally threaded enlarged end portion 74 of the sleeve 44 in order that the sleeve may be moved when the plunger 60 is moved.

The barrel provided with an internally threaded end portion for receiving an externally threaded end member 76 which has a central opening therethrough for receiving the reduced portion '78 of a rod 80 which extends through a central opening 82 in a spring retaining element 84 connected with the head portion of the plunger 60 and into the chamber 66 of the head portion. The reduced portion 78 is threaded for receiving a nut 86 for connecting the rod 80 with the end member '76.

The end member' 76 is provided with passageways 88 through which gas may pass.

The opening 82 in the spring retaining element is of greater diameter than the rod 80 for permitting gas to enter the chamber 66.

The head portion of the plunger' 60 is threaded internally at the end thereof for connection with the spring retaining element 84 which is threaded externally.

The rod 80 is provided with a head portion 90, positioned within the chamber 66. A spring 92 is disposed on the rod 8O and is positioned between the head portion 90 and the spring retaining element 84 for yieldingly retaining the plunger in its normal position, as shown in Figure 2.

The barrel is provided with longitudinally eX- tending grooves 94 which are positioned so that gas cannot pass by the plunger when the plunger is disposed in the normal position shown is Figure 2.

From the foregoing description of the various parts of the device, the operation thereof may be readily understood.

When the valve actuating member 96 of the valve mechanism is disposed in the position shown in Figure 1 the mechanism is closed for shutting off communication between the gas supply line 16 and the plunger 60. When it is desired to operate the device, the actuating member' 96 is moved to its dotted line position shown in Figure 1 thereby opening the valve mechanism for enabling the gas under pressure to flow to the plunger,

The gas passes from the valve mechanism 12 through the passageways 88 and the opening 82 and engages the plunger thereby moving the plunger to the right i'n Figure 2.

The plunger is moved until it passes the ends 98 of the grooves at which time the gas passes through the grooves 94 and between the sleeve 44 and the extension 18 into the nozzle. As shown in Figure 2 the extension 18 is provided with a projecting portion 100, having the end thereof disposed adjacent to the enlarged end portion 74 of the sleeve.

The extent of the movement of the plunger 60 is limited by the distance between the enlarged portion 740i the sleeve 44 and the end of the projecting portion 100, as plunger 60 may be moved by gas of suicient pressure until the enlarged portion 74 engages the projecting portion 100. When the members 74 and 100 are in contact and the valve 96 open, gas can flow into the passage 54 through ports 101 in the member' 100.

It will be noted that the distance between the enlarged portion 74 and the projecting portion 100 may be varied by rotating the extension 18 and that the amount of gas permitted to flow by the plunger' may consequently be varied.

When the plunger is moved the sleeve 44 is also actuated for moving the valve seat element 50 out of engagement with element 40, thereby permitting the liquid under pressure in the tubular member 32, to flow through the passageway 42 and the openings 52 into the nozzle.

The gas and liquid combine in the nozzle and pass through the opening in the nozzle for providing a spray.

When a dense spray is required the extension 18 is rotated for moving the projection 100 a greater distance from the enlarged end portion 74 thereby causing the valve seat element to be moved a greater distance from the element 46 and permitting a greater ilow of liquid into the nozzle in proportion to the ilow of gas into the nozzle. When it is desired to provide a less dense spray the extension 18 is rotated conversely, for shortening the distance that the valve seat element 50 may be moved from the element 40, and thereby decreasing the iiow of liquid into the nozzle in proportion to the flow of gas.

While I have illustrated and described the construction of a preferred embodiment of my lnvention, it will be readily understoodthat various modifications and changes may be made without departing from the spirit or scope of the invention.

I claim:

1. A spraying device comprising a tubular casing having a gas receiving end adapted for connection with a gas supply means and the other end provided with a nozzle, a tubular member' disposed within the casing and extending longitudinally thereof in spaced relationship therewith,

said tubular member having an end in communication with a liquid supply means and a free end positioned adjacent to the nozzle, a tubular sleeve slidably disposed on the tubular member and provided with an end seat portion positioned to ig open and close the free end of the tubular meniber, a plunger slidably disposed in the gas receiving end of the casing and connected with the tubular sleeve, a passage for conveying the gas past said plunger and having an intake end so positioned as to be opened and closed by said plunger, and spring means so operatively associated with said plunger` as to yieldingly retain the same in the position to close said passage and said free end of said tubular member, the conportion, a tubular member disposed within the barrel and extension and having the forward end thereof positioned adjacent to the nozzle, means for connecting the other end of the tubular member with the barrel and for providing communication between the tubular member and rou a liquid supply means, a tubular sleeve slidably disposed on the tubular member and provided with an end seat positioned for opening and closing the forward end of the tubular member, said sleeve being provided with a liquid outlet adjacent the end seat portion, a plunger slidably disposed in the barrel, means for connecting the plunger with the sleeve, a passage for conveying gas past said plunger and having an intake end so positioned as to be opened and closed by said plunger, and a spring so operatively associated with the plunger as to yieldingly retain the same in the position to close said passage and said forward end of said tubular member, the construction and arrangement being such that upon admission of gas to said casing it acts upon said plunger to cause said plunger to open said passage and move said end seat portion to open said tubular member and permit liquid to pass through said outlet of said sleeve.

3. A spraying device comprising a tubular barrel, having an end connected with a gas supply means, a tubular extension movably connected with the barrel and provided with a nozzle end portion, a tubular member disposed within the barrel and extension and having a forward end thereof positioned adjacent to the nozzle, means for connecting the other end of the tubular member with the barrel and for providing communication between the tubular member and a liquid .supply means, a tubular sleeve slidably disposed on the tubular member and provided with an end seat portion positioned for opening and closing the forward end of the tubular member said sleeve being provided with a liquid outlet adjacent the end seat portion, a plunger slidably disposed in the barrel, means for connecting the plunger with the sleeve, a passage for conveying gas past said plunger and having an intake end so positioned as to be opened and closed by said plunger, a spring so operatively associated with the plunger as to yieldingly retain the same in the position to close said passage and said forward end of said tubular member, the construction and arrangement being such that upon admission of gas to said casing it acts upon said plunger to cause the same to open said passage and move said end seat portion to open said tubular member, and means associated with the tubular extension for limiting the movement of the plunger.

4. A spraying device comprising a tubular barrel having an end connected with a gas supply means, a tubular extension movably connected with the barrel and provided with a nozzle end portion, a tubular member disposed within the barrel and extension and having a forward end thereof positioned adjacent to the nozzle, means for connecting the other end of the tubular member with the barrel and for providing communication between the tubular member and a liquid supply means, a tubular sleeve slidably disposed on the tubular member and provided with an end seat portion positioned for opening and closing the forward end of the tubular member, said sleeve being provided with a liquid outlet adjacent the end seat portion, a plunger slidably disposed in the barrel, means for connecting the plunger with the sleeve, a passage for conveying gas past said plunger and having an intake end so positioned as to be opened and closed by said plunger, a spring so operatively associated with the plunger as to yieldingly retain the same in the position to close said passage and said forward end of said tubular member, the construction and arrangement being such that upon admission of gas to said casing it acts upon said plunger to cause said plunger to open said passage and move said end seat portion to open said tubular member, and means associated with the tubular extension for limiting the movement of the plunger, said tubular extension being moved axially with respect to the barrel for varying the distance that the plunger may be moved.

5. A spraying device comprising a tubular casing having a gas receiving end and a spray nozzle at the forward end, a stationary liquid supply tube disposed centrally of the forward portion of said casing in spaced relation with respect thereto and having a liquid outlet port at its forward end, a sleeve telescopically mounted on said liquid supply tube and having an outlet for liquid in a wall thereof and a closing member for said port, said sleeve being spaced from the interior of said casing to provide a gas passage communicating with said nozzle, a gas pressure actuated piston in said casing connected to said sleeve, said piston being arranged to move forwardly in said casing upon admission of sleeve and closing member forwardly to uncover said liquid outlet port, a gas passage between said piston and casing for conveying gas past said piston to said rst mentioned gas passage, and a spring tending to move said piston and sleeve rearwardly for closing said liquid outlet port.

6. A spraying device comprising a tubular casing having a gas receiving end and a spray nozzle at the forward end thereof, a liquid supply tube positioned centrally within the forward portion of said casing in spaced relation with respect thereto and having a liquid outlet port at its forward end, a sleeve telescopically mounted on said tube and having means for closing said port when said sleeve is retracted, said sleeve being spaced from said casing to provide a longitudinal gas passage communicating with said nozzle, a gas pressure actuated piston in said casing connected with said sleeve and arranged to move forwardly upon admission of gas to said casing for moving said port closing means to open position, a passage for gas between said piston and casing providing communication between the gas receiving end of said casing and said rst mentioned gas passage, and a spring in said casing tending to retract said piston and effect the closing of said liquid port.

JOHN C. PURDIE.

gas to said casing ior moving said per 

